Storage sites (such as saline aquifers and depleted oil fields)

Storage sites like saline aquifers and depleted oil fields are underground formations used to safely hold carbon dioxide (CO₂) emissions to reduce climate change. Saline aquifers are natural, porous-rock layers filled with salty water, while depleted oil fields are former oil reservoirs that no longer produce oil. Both sites are chosen because they can securely trap CO₂ deep underground, preventing it from entering the atmosphere. Once stored, the CO₂ remains trapped for long periods, helping to mitigate greenhouse gases associated with industrial activities and fossil fuel use.